The Khazar Khaganate was the main enemy of Rus' for two centuries. And you need to know the enemy by sight without discounting the fact that a thousand years have already passed since this state was defeated by the Russian princes Oleg the Prophet and Vladimir the Saint... As the example of Israel shows, countries and peoples can rise from oblivion even after millennia. Especially when we are talking about such a mysterious state as Khazaria, which even after ten centuries continues to influence our lives. This book presents the works of three authors (Gumilev L.N., Manyagin V.G., Pletneva S.A.) , each of whom, from his own point of view, tried to understand and reveal the mystery of the origin, development, death and... posthumous life of Khazaria - one of the most mysterious states on the planet.